Changes & Additions:
- 
Undead horses — except for husk horses and wither skeleton horses — now burn in direct daylight. (toggleable, off by default) 
- 
Zombie horses, drowned horses, and husk horses sometimes spawn in abandoned villages. (toggleable, on by default) 
- 
Drowned horses sometimes spawn in large underwater ruins. (toggleable, on by default) 
- 
Added the ability to convert zombie horses, drowned horses, & husk horses into regular horses. 
- 
Changed the particles emitted when using a sponge to dry out a zombie horse or a drowned horse. Now uses the "cloud" particle instead of the "small_gust" particle. 
Bug Fixes:
- The advancement used to determine whether or not to spawn a trapped horse no longer checks the player's location.

